Hollywood loves honoring itself. Usually the reasons can seem quite selfish, but there was no selfishness this weekend at the 2013 Environmental Media Awards.

All your favorite celebrities were looking fabulous on the red carpet for a very good cause. Glee cutie Darren Criss not only graced us with his presence on the carpet, but also on stage, where he opened the show singing “What A Wonderful World”. You know, it is more wonderful when Darren sings. Check out the performance after the jump.

Both Matt Damon and Hayden Panettierewere honored with awards this weekend for their work with environmental organizations. Matt accepted the Ongoing Commitment award for his work with Water.org.

Newly engaged Hayden and her giant engagement ring–which she apparently designed herself–received the Futures Award. She had my favorite line of the night saying, “Twerking is not going to solve global warming.” Lady has a point.

Watch the video of Darren singing below, then launch the gallery to check out all the photos of your favorite celebs like Lance Bass, Josh Henderson, Malin Akermanand more. Also, my current crush Scott Bakula was there. Quantum Leap forever and always.